A cooling fan humidification control method and system

Abstract

The application discloses a cold fan humidification control method and system, and relates to the field of cold fans. The method comprises the following steps: step 1, adjusting the rotating speed of a fan to be less than or equal to a set rotating speed threshold; step 2, enabling a water pump to supply water to a wet curtain and obtaining water pump water supply time; and step 3, comparing the water supply time obtained in step 2 with a water supply time threshold, and adjusting the rotating speed of the fan to be greater than the set rotating speed threshold when the water pump water supply time is greater than or equal to the water supply time threshold. The application can effectively solve the problem of water flying caused by starting humidification under high rotating speed of the fan in the cold fan.

Description

Technical Field

[0001] This invention relates to the field of air coolers, specifically to a humidification control method and system for air coolers. Background Technology

[0002] Air purifiers can further lower the ambient temperature through humidification. The principle is that a wet curtain is installed at the air outlet of the air purifier, and a water tank and pump are located inside the purifier. When humidification is activated, the pump sprays water from the tank onto the wet curtain. When the air generated by the fan passes through the wet curtain and is blown out, it is cooled by the water on the curtain, resulting in cool air and thus lowering the ambient temperature. However, in actual use, when the fan is running at high speed and humidification is activated, some moisture in the wet curtain packing is blown out by the high-velocity air. This moisture mixes with the high-velocity air and is then ejected from the air purifier, causing water splashing and severely impacting the user experience. Summary of the Invention

[0003] This invention provides a humidification control method and system for air coolers to solve the problem of water splashing in existing air coolers.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for controlling humidification in a cooling fan includes the following steps:

[0006] Step 1: Adjust the current speed of the fan in the air purifier to be less than or equal to the set speed threshold;

[0007] Step 2: Start the water pump in the evaporative air conditioner to supply water to the evaporative cooling pad, and obtain the current water supply time of the pump;

[0008] Step 3: Compare the current water supply time of the water pump obtained in Step 2 with the water supply time threshold. When the current water supply time of the water pump is less than the water supply time threshold, keep the speed of the fan less than or equal to the set speed threshold. When the current water supply time of the water pump is greater than or equal to the water supply time threshold, adjust the speed of the fan to be greater than the set speed threshold.

[0009] Further step 1 also includes: obtaining the current speed of the fan, comparing the current speed of the fan with a set speed threshold, and keeping the fan speed unchanged when the current speed of the fan is less than or equal to the set speed threshold; and adjusting the fan speed to be less than or equal to the set speed threshold when the current speed of the fan is greater than the set speed threshold.

[0010] Further step 3 also includes: obtaining the current flow rate of the water pump, and calculating the water supply time threshold based on the current flow rate of the water pump, the volume parameters of the wet curtain, and the moisture absorption capacity coefficient of the wet curtain, wherein the moisture absorption capacity coefficient reflects the relationship between the water pump flow rate, the water supply time, and the time it takes for the wet curtain to completely absorb water.

[0011] In the further step 3, let the current flow rate of the water pump be P, the volume parameter of the wet curtain be V, the moisture absorption capacity coefficient be F, and the water supply time threshold be M. Then, the water supply time threshold M is calculated by formula (1), which is as follows:

[0012]

[0013] In further step 3, when the current water supply time of the water pump is greater than or equal to the water supply time threshold, the speed of the fan is adjusted to be greater than the set speed threshold using a gradient adjustment method.

[0014] Further step 3 also includes: obtaining the fan speed setting value, and when the current water supply time of the water pump is greater than or equal to the water supply time threshold, adjusting the speed of the fan to the obtained fan speed setting value.

[0015] A humidification control system for an air cooler includes a controller and a data acquisition device. The data acquisition device collects operating data of a water pump and a fan and transmits it to the controller. The controller controls the water pump and controls the fan according to the humidification control method described above based on the operating data collected by the data acquisition device.

[0016] Furthermore, the operating data of the water pump includes the current water supply time data.

[0017] Furthermore, the operating data of the water pump includes the current flow rate data of the water pump.

[0018] Furthermore, the operating data of the fan includes the current rotational speed of the fan.

[0019] This invention proposes a novel humidification control method for evaporative cooling fans to address the problem of water splashing. The main cause of water splashing is that when water enters the evaporative cooling pad, it is not fully absorbed by the pad material before encountering high-speed airflow, causing the water to be blown out. Therefore, this invention adjusts the fan speed to less than or equal to a set speed threshold at the start of humidification and controls the water pump supply time to greater than or equal to a supply time threshold. This ensures that the evaporative cooling pad can fully absorb the water. Once the pad has fully absorbed the water, the fan speed is then adjusted to greater than the set speed threshold, thus preventing water splashing caused by insufficient water absorption.

[0020] In this invention, the set rotation speed threshold is 1100 rpm. This data was obtained experimentally. At this rotation speed threshold, regardless of whether the moisture is fully absorbed by the wet curtain material, no water splashing will occur. Therefore, this invention uses 1100 rpm as the basis for adjusting the fan speed at the start of humidification, which can ensure that water splashing is avoided in the initial stage of humidification.

[0021] In this invention, the current water supply time of the water pump is adjusted based on a water supply time threshold. This threshold can be obtained experimentally. The time required for the evaporative cooling pad to fully absorb water under fixed cooling pad volume and water supply volume conditions is the water supply time threshold. Therefore, when the evaporative cooling pad volume is the fixed volume obtained in the experiment, and the current flow rate of the water pump is the fixed water supply volume, the current water supply time of the water pump can be adjusted according to the experimentally obtained water supply time threshold. This ensures that the current water supply time is greater than or equal to the water supply time threshold, thereby ensuring that the evaporative cooling pad fully absorbs water and preventing water splashing.

[0022] In practical applications of evaporative cooling fans, the flow rate of the water pump may vary each time it is started, but the volume of the evaporative cooling pad remains constant. Therefore, in this invention, the corresponding water supply time threshold can be calculated using formula (1) based on the current flow rate of the water pump each time it is started, and the current water supply time of the water pump can be controlled based on the calculated water supply time threshold, thereby avoiding the problem of water splashing.

[0023] In this invention, when the water pump supply time is greater than or equal to the water supply time threshold, the wet curtain fully absorbs the water. At this time, the fan speed is adjusted to be greater than the set speed threshold, thereby avoiding the problem of water splashing. When adjusting the fan speed, a gradient adjustment method can be used to avoid the problem of the whole machine shaking caused by the fan drive motor driving the load and transmitting vibration when the fan speed suddenly changes significantly.

[0024] In summary, compared with the prior art, the present invention can effectively solve the problem of water splashing when the fan starts humidification at high speed in the air cooler, and the entire process can be intelligently and automatically executed through software. Attached Figure Description

[0025] Figure 1 This is a flowchart of an embodiment of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the embodiments will be described in detail below with reference to the accompanying drawings and examples. This will allow for a full understanding of how the present invention uses technical means to solve technical problems and achieve corresponding technical effects, and to facilitate its implementation. The embodiments of the present invention and the various features within them can be combined with each other without conflict, and all resulting technical solutions are within the protection scope of the present invention.

[0027] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment discloses a humidification control method for an air cooler, including the following steps:

[0031] Step 1: Determine if there is water in the water tank of the chiller based on the water level. If there is water, check if the chiller fan is on. If the fan is off, start it and adjust its current speed to be less than or equal to a set speed threshold. If the fan is on, obtain its current speed and compare it with the set speed threshold. If the current speed is less than or equal to the set speed threshold, maintain the fan speed; if the current speed is greater than the set speed threshold, adjust the fan speed to be less than or equal to the set speed threshold.

[0032] The evaporative air cooler involved in this embodiment is also known as an eco-friendly air conditioner, energy-saving and environmentally friendly air conditioner (as called in Guangdong and Guangxi), water-cooled air conditioner, etc. Its principle is to use low-temperature cold water to absorb heat from flowing air, thus lowering the air temperature and achieving a cooling function. When the evaporative air cooler is working, a water pump continuously draws water from the water tank and delivers it to the evaporative cooling pad. The evaporative cooling pad absorbs the moisture, and then the fan blows air out. The air blown out by the fan passes through the moisture-absorbing evaporative cooling pad, lowering its temperature. Finally, the air blown out by the fan enters the room, achieving the purpose of cooling the room.

[0033] In this embodiment, the evaporative cooling pad in the fan is made of a polymer material processed using spatial cross-linking technology, and has a honeycomb porous structure. When unsaturated air from the fan flows over the porous, moist surface of the cooling pad, a large amount of moisture evaporates, and the sensible heat in the air, as expressed by temperature, is converted into latent heat of vaporization, thereby lowering the air's temperature. By continuously blowing out an uninterrupted airflow from the fan, the cooled air from the cooling pad is continuously introduced into the room, achieving a cooling effect. Therefore, the evaporative cooling pad in the fan utilizes its absorbed moisture to cool the passing airflow.

[0034] Therefore, in this embodiment, when the cooling fan humidifies the evaporative cooling pad, it first needs to ensure that water can be supplied to the evaporative cooling pad. Thus, in this embodiment, the water level in the water tank needs to be detected first when humidification is turned on. Specifically, a liquid level sensor is installed in the water tank, and the signal collected by the liquid level sensor can determine whether there is water in the tank.

[0035] The evaporative air cooler has both normal air supply and cooling air supply functions. In normal air supply mode, only the fan needs to operate. In cooling air supply mode, both the fan and the water pump need to humidify the evaporative cooling pad simultaneously. Therefore, before cooling air supply, the evaporative air cooler may be in an inactive state with the fan off, or it may be in a normal air supply state with the fan on. Therefore, in this embodiment, after the water level in the tank is determined to be filled, further assessment of the fan's current operating status is required.

[0036] Since the problem of water splashing in the evaporative cooling fan is mainly due to the moisture not being fully absorbed by the evaporative cooling pad, and the fan creates a high-speed airflow, the unabsorbed moisture will be carried away by the high-speed airflow, thus forming water splashing. Therefore, in this embodiment, the fan speed is controlled at the beginning of humidification so that the airflow speed created by the fan is insufficient to carry away the moisture that has not been absorbed by the evaporative cooling pad. This can avoid the problem of water splashing at the beginning of humidification.

[0037] In this embodiment, the fan speed is controlled to be less than or equal to a set speed threshold to avoid water splashing caused by excessively high airflow during the initial humidification stage. The set speed threshold in this embodiment is 1100 rpm, which was determined experimentally. During the experiment, under standard atmospheric pressure, it was observed whether water splashing occurred when the current material's evaporative cooling pad absorbed water under the current water supply conditions at different fan speeds. Multiple sets of experiments were conducted sequentially, with the fan speed increasing by 100 rpm in each subsequent set. Through multiple sets of experiments, the minimum fan speed required to prevent water splashing from the current material's evaporative cooling pad was determined. Then, various commonly used evaporative cooling pads of different materials were used, and different water supply rates were set, repeating the above experimental process to obtain multiple sets of minimum fan speeds required to prevent water splashing from the current material's evaporative cooling pad. The experiment showed that when the fan speed is 1100 rpm, the requirement of preventing water splashing from commonly used evaporative cooling pads of different materials under any water supply flow conditions can be met. Therefore, this embodiment uses 1100 rpm as the set speed threshold.

[0038] In this embodiment, by setting the current fan speed to be less than or equal to the speed threshold of 1100 rpm during the initial stage of humidification, it can be ensured that no water splashing occurs during the humidification and dehumidification stages.

[0039] Step 2: Turn on the humidifier to start the water pump in the air cooler to supply water to the evaporative cooling pad, and obtain the current water supply time of the water pump.

[0040] In this embodiment, by controlling the current speed of the fan in step 1 and then ordering the water pump to supply water to the wet curtain, it can be ensured that no water splashing occurs during the process of the water pump supplying water to the wet curtain for humidification.

[0041] In this embodiment, the current water supply time of the water pump can be obtained by monitoring the water flow rate or operating parameters of the water pump. In one case, the current operating time of the water pump is obtained by monitoring the duration of the water flow output by the pump. Specifically, during the process from start-up to stable operation, the output water flow rate of the water pump increases abruptly and then remains stable. Therefore, by monitoring the starting point of the abrupt increase in water flow rate and continuously timing it, the current water supply time of the water pump can be obtained. In another case, the current operating time of the water pump is obtained by acquiring the duration of electrical signals such as the pump's operating current. Specifically, in the water pump's drive circuit, an electrical signal acquisition device such as a current sensor acquires the duration of the corresponding electrical signal and times it, thereby obtaining the current operating time of the water pump.

[0042] Step 3: Compare the current water supply time of the water pump obtained in Step 2 with the water supply time threshold M. When the current water supply time of the water pump is less than the water supply time threshold M, keep the fan speed less than or equal to 1100 rpm. When the current water supply time of the water pump is greater than or equal to the water supply time threshold M, adjust the fan speed to the target speed greater than 1100 rpm.

[0043] In this embodiment, the water supply time threshold M can be a preset fixed value or a calculated value based on a formula. By adjusting the fan speed after ensuring that the water pump's current water supply time reaches at least the water supply time threshold M, the evaporative cooling pad can fully absorb water, preventing water that is not fully absorbed by the cooling pad from being carried away by the air blown by the fan and causing splashing.

[0044] For some types of evaporative air coolers, the water pump flow rate is set to a fixed value. This means the pump's drive motor operates at a fixed speed, causing the pump blades to operate at a constant flow rate. Therefore, a fixed water supply time threshold M can be obtained through prior experimentation. During the experiment, the pump supplies water to the evaporative cooling pad at the set fixed flow rate. The change in the weight of the cooling pad is used to determine whether the pad has fully absorbed the water. When the weight of the cooling pad no longer increases, it indicates that the pad has fully absorbed the water. The corresponding time at this point is taken as the fixed water supply time threshold M.

[0045] It should be noted that for air cooler equipment with adjustable water pump flow rate, a fixed water supply time threshold M can also be obtained through experiments. During the experiment, the water pump supplies water to the evaporative cooling pad of the air cooler at different flow rates within its adjustable flow range, and the time it takes for the evaporative cooling pad to fully absorb water at different flow rates is recorded. This yields a series of time values, and the largest time value is taken as the water supply time threshold M. The largest time value ensures that the evaporative cooling pad can fully absorb water at any flow rate within its adjustable flow range. Therefore, the largest time value is used as the fixed water supply time threshold M for the water pump in this embodiment of the air cooler.

[0046] For some types of evaporative air cooler equipment, the flow rate of its water pump can be set and adjusted. That is, the flow rate of the water pump in the next humidification cycle is different from that in the previous humidification cycle, or the flow rate of the water pump changes according to the adjustment during the current humidification process. In this case, the current flow rate of the water pump when it starts is obtained, and the water supply time threshold M is calculated using formula (1). Formula (1) is shown below:

[0047]

[0048] In formula (1), P is the current flow rate of the water pump, V is the volume of the wet curtain in the evaporative cooling fan, and F is the moisture absorption capacity coefficient.

[0049] In this embodiment, the moisture absorption capacity coefficient F in formula (1) reflects the relationship between the water pump flow rate, water supply time, and the time it takes for the wet curtain to completely absorb moisture. The moisture absorption capacity coefficient F can be obtained experimentally. During the experiment, the wet curtain in the evaporative air cooler was used as the experimental object. Under standard atmospheric pressure, the time it took for wet curtains of different sizes to completely absorb moisture under the same water pump flow rate was measured, as well as the time it took for wet curtains of the same size to completely absorb moisture under different water pump flow rates. Then, a BP neural network was used for data processing.

[0050] A back-propagation (BP) neural network is a multi-layer feedforward neural network trained using an error backpropagation algorithm. Its architecture includes an input layer, an output layer, and hidden layers between the input and output layers. Each layer contains multiple neurons, and the neurons in each layer are interconnected. The BP neural network is based on the BP algorithm, whose basic idea is gradient descent. It utilizes gradient search techniques to minimize the mean squared error between the actual and expected output values. The basic BP algorithm includes two processes: forward propagation of the signal and backward propagation of the error. That is, the error output is calculated from input to output, while the weights and thresholds are adjusted from output to input. During forward propagation, the input signal acts on the nodes of the output layer through the hidden layers, undergoing a nonlinear transformation to generate the output signal. If the actual output does not match the expected output, the backward propagation process begins. Error backpropagation propagates the output error back through the hidden layers to the input layer layer by layer, distributing the error to all units in each layer. The error signals obtained from each layer are used as the basis for adjusting the weights of each unit. By adjusting the connection strength between input nodes and hidden layer nodes, the connection strength between hidden layer nodes and output nodes, and the threshold, the error is reduced along the gradient direction. After repeated learning and training, the network parameters (weights and thresholds) corresponding to the minimum error are determined, and training stops. At this point, the trained neural network can automatically process input information from similar samples to obtain information that has undergone nonlinear transformation with the minimum output error.

[0051] In this embodiment, the volume data of the wet curtain, the flow data of the water pump, and the time data of the wet curtain completely absorbing water during the experiment are fed into the BP neural network for multiple training sessions. Different moisture absorption capacity coefficients are set during the training of the BP neural network, and the time calculation value is calculated based on formula (1). During each training session, the time time of the wet curtain completely absorbing water during the experiment is used as the basis to judge whether the time calculation value is correct. A curve is obtained through repeated cross-training. The moisture absorption capacity coefficient is adjusted until the maximum time calculation value is located on the curve. The moisture absorption capacity coefficient set at this time is F.

[0052] In this embodiment, when using a water pump with adjustable flow rate, the water supply time threshold M is calculated using formula (1), and then the fan speed is adjusted to be greater than 1100 rpm. When adjusting the fan speed, a gradient adjustment method can be used. In gradient adjustment, multiple time periods and the fan speed increment in each time period are set. Based on the set time periods and the fan speed increment, the fan speed is adjusted from the current speed to the target speed. Taking the current fan speed of 1100 rpm as an example, and the speed needs to be adjusted to 2000 rpm within a total time of 6 minutes, the 6 minutes can be divided into three time periods. The first time period is 1 minute, and the fan speed is increased by 150 rpm in the first time period. The second time period is 2 minutes, and the fan speed is increased by 300 rpm in the second time period. The third time period is 3 minutes, and the fan speed is increased by 450 rpm in the third time period. Based on the above gradient method, the fan speed is adjusted from 1100 rpm to 2000 rpm.

[0053] Considering that different types of air coolers have varying fan speeds, some with a pre-set, non-adjustable speed, while others have an adjustable speed that can be set in real-time via a specific speed setting, this embodiment addresses the first scenario. It obtains a preset speed value from the fan control program, using a speed greater than 1100 rpm as the target speed. When the current water supply time is greater than or equal to a water supply time threshold M, the fan speed is adjusted to the target speed greater than 1100 rpm. For the second scenario, this embodiment obtains the current fan speed setting by detecting the electrical signals of different fan speed settings to determine the selected fan speed. It further determines whether the speed corresponding to the selected fan speed setting is greater than 1100 rpm. If it is, the speed corresponding to the selected fan speed setting is used as the target speed. Therefore, when the current water supply time is greater than or equal to the water supply time threshold M, the fan speed is adjusted to the target speed greater than 1100 rpm.

[0054] Example 2

[0055] This embodiment discloses a humidification control system for the humidification control method described in Embodiment 1, including a controller and a data acquisition device, wherein the data acquisition device collects the operating data of the water pump and the fan and transmits it to the controller.

[0056] In this embodiment, the controller is an electronic device such as a PLC or MCU that has signal acquisition and output functions. The signal output terminal of the controller is electrically connected to the control terminals of the water pump drive motor and the fan drive motor, respectively. Specifically, the signal output terminal of the controller is electrically connected to the control terminals of the frequency converters configured for the water pump drive motor and the fan drive motor. Thus, the controller can control the speed of the water pump drive motor and the fan drive motor through the corresponding frequency converters, thereby controlling the speed of the blades in the water pump and the fan blades, and realizing the control of the water pump flow rate and the fan speed.

[0057] In this embodiment, the data acquisition device includes an AD conversion module, a liquid level sensor, a water flow sensor, a speed sensor, and a timer in the controller. The liquid level sensor is installed inside the water tank of the cooling fan to collect liquid level data. Based on the liquid level data collected by the liquid level sensor, the controller can determine whether there is water in the tank. The water flow sensor is installed at the water pump outlet to detect the current water flow rate of the pump. The speed sensor is installed on the fan shaft to detect the current fan speed. The liquid level sensor, water flow sensor, and speed sensor are electrically connected to the digital signal input terminal of the controller through the AD conversion module, thereby sending the data collected by each sensor to the controller.

[0058] The controller controls the fan speed based on data collected from various sensors. Specifically, when the controller starts the water pump to supply water to the evaporative cooling pad, the water flow sensor collects the current water flow data as the pump's operating data and transmits it to the controller. The controller uses a timer to record the duration of the data received from the water flow sensor; this duration is the current water supply time, which is used as another operating data point for the pump. When the controller starts the fan, the speed sensor collects the current fan speed data as the fan's operating data and transmits it to the controller.

[0059] After the controller collects data from the liquid level sensor and the speed sensor, it controls the fan to operate according to step 1 of the humidification control method disclosed in Example 1. Then, based on the data collected by the water flow sensor and the timing data of the timer, the controller controls the fan to operate according to steps 2 and 3 of the humidification control method disclosed in Example 1.

[0060] In this embodiment, the controller's communication port is also connected to a communication module, through which the controller communicates with external devices to exchange data. Thus, the controller can transmit data collected by various sensors and control data acquired by the controller to external devices via the communication module. Simultaneously, external devices can send control commands to the controller via the communication module to achieve remote control.

[0061] Example 3

[0062] This embodiment discloses an electronic device for implementing the humidification control method described in Embodiment 1, including a processor and a memory. The memory has any commonly used form of storage medium, and the storage medium contains program instructions that can be read and executed by the processor.

[0063] In this embodiment, the program instructions include a data acquisition module, a comparison and judgment module, and a control instruction module. The data acquisition module acquires and stores water pump flow rate data, water supply time data, fan speed data, a fixed water supply time threshold, and a fan speed threshold. The comparison and judgment module retrieves the fan speed data and water pump water supply time data from the data acquisition module and compares them with the fan speed threshold and the water pump water supply time data with the water supply time threshold to obtain a comparison result. The control instruction module acquires the comparison result from the comparison and judgment module and generates a fan control instruction. Therefore, when the program instructions are read and run by the processor, steps 1-3 of the humidification control method described in Embodiment 1 are executed.

[0064] Alternatively, in this embodiment, the program instructions include a data acquisition module, a calculation module, a comparison and judgment module, and a control instruction module. The data acquisition module acquires and stores water pump flow rate data, water supply time data, fan speed data, fan speed threshold, wet curtain volume parameter data, and moisture absorption coefficient data. The calculation module retrieves the water pump flow rate data, wet curtain volume parameter data, and moisture absorption coefficient data from the data acquisition module and calculates the results according to formula (1). The comparison and judgment module retrieves the fan speed data and water pump water supply time data from the data acquisition module, and acquires the calculation results from the calculation module. It then compares the fan speed data with the fan speed threshold and the water pump water supply time data with the calculation results from the calculation module to obtain comparison results. The control instruction module acquires the comparison results from the comparison and judgment module and generates fan control instructions. Therefore, when the program instructions are read and run by the processor, steps 1-3 of the humidification control method described in Embodiment 1 are executed.

[0065] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the scope or concept of the invention. The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of the present invention, should also be considered as part of this disclosure. To avoid unnecessary repetition, the present invention will not further describe the various possible combinations.

[0066] This invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this invention and without departing from the design idea of ​​this invention, all modifications and improvements made by those skilled in the art to the technical solutions of this invention should fall within the protection scope of this invention. The technical content for which protection is sought in this invention has been fully described in the claims.

Claims

1. A method for controlling humidification in a cooling fan, characterized in that, Includes the following steps: Step 1: Adjust the current speed of the fan in the evaporative cooling fan to be less than or equal to the set speed threshold; wherein, the speed threshold meets the requirement that the evaporative cooling pad does not spray water under any water supply flow conditions; Step 2: Start the water pump in the air cooler to supply water to the evaporative cooling pad, and obtain the current water supply time of the pump; Step 3: Compare the current water supply time of the pump obtained in Step 2 with the water supply time threshold. When the current water supply time is less than the water supply time threshold, keep the fan speed less than or equal to the set speed threshold; when the current water supply time is greater than or equal to the water supply time threshold, adjust the fan speed to be greater than the set speed threshold. Step 3 further includes: obtaining the current flow rate of the water pump, and calculating the water supply time threshold based on the current flow rate of the water pump, the volume parameter of the wet curtain, and the moisture absorption coefficient of the wet curtain, wherein the moisture absorption coefficient reflects the relationship between the water pump flow rate, the water supply time, and the time for the wet curtain to completely absorb water; in step 3, let the current flow rate of the water pump be P, the volume parameter of the wet curtain be V, the moisture absorption coefficient be F, and the water supply time threshold be M, then the water supply time threshold M is calculated by formula (1), which is as follows: （1） The moisture absorption capacity coefficient F is obtained from experiments. During the experiment, the wet curtain in the evaporative cooling fan is used as the experimental object. Under standard atmospheric pressure, the time for wet curtains of different sizes to completely absorb water under the same water pump flow rate is measured, as well as the time for wet curtains of the same size to completely absorb water under different water pump flow rates is measured. The wet curtain volume data, water pump flow data and the corresponding wet curtain time data to completely absorb water during the experiment are input into the BP neural network for multiple trainings. Different moisture absorption capacity coefficients are set during the training of the BP neural network, and the time calculation value is calculated based on formula (1). Each time during training, the time for the wet curtain to completely absorb water is used as the basis to judge whether the time calculation value is correct. A curve is obtained through repeated cross-training. The moisture absorption capacity coefficient is adjusted until the maximum number of time calculation values ​​are located on the curve. The moisture absorption capacity coefficient set at this time is the moisture absorption capacity coefficient F.

2. The humidification control method for a cooling fan according to claim 1, characterized in that, Step 1 further includes: obtaining the current speed of the fan, comparing the current speed of the fan with a set speed threshold, and keeping the fan speed unchanged when the current speed of the fan is less than or equal to the set speed threshold; and adjusting the fan speed to be less than or equal to the set speed threshold when the current speed of the fan is greater than the set speed threshold.

3. The humidification control method for a cooling fan according to claim 1, characterized in that, In step 3, when the current water supply time of the water pump is greater than or equal to the water supply time threshold, the speed of the fan is adjusted to be greater than the set speed threshold by using a gradient adjustment method.

4. A humidification control method for a cooling fan according to claim 1 or 3, characterized in that, Step 3 further includes: obtaining the fan speed setting value, and when the current water supply time of the water pump is greater than or equal to the water supply time threshold, adjusting the speed of the fan to the obtained fan speed setting value.

5. A humidification control system for a cooling fan, characterized in that, The device includes a controller and a data acquisition device. The data acquisition device collects the operating data of the water pump and the fan and transmits it to the controller. The controller controls the water pump and controls the fan according to the humidification control method described in any one of claims 1-4 based on the operating data collected by the data acquisition device.

6. The humidification control system for a cooling fan according to claim 5, characterized in that, The pump's operating data includes the pump's current water supply time data.

7. The humidification control system for a cooling fan according to claim 6, characterized in that, The pump's operating data includes the pump's current flow rate.

8. The humidification control system for a cooling fan according to claim 5, characterized in that, The operating data of the fan includes the current rotational speed of the fan.

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